The Collaborative International Dictionary of English v.0.48:

Misdo \Mis*do"\ (m[i^]s*d[=oo]"), v. t. [imp. Misdid; p. p.
   Misdone (m[i^]s*d[u^]n"); p. pr. & vb. n. Misdoing.] [AS.
   misd[=o]n. See Do, v.]
   [1913 Webster]
   1. To do wrongly.
      [1913 Webster]

            Afford me place to show what recompense
            Towards thee I intend for what I have misdone.
                                                  --Milton.
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   2. To do wrong to; to illtreat. [Obs.] --Chaucer.
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The Collaborative International Dictionary of English v.0.48:

Misdo \Mis*do"\, v. i.
   To do wrong; to commit a fault.
   [1913 Webster]

         I have misdone, and I endure the smart.  --Dryden.
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WordNet (r) 3.0 (2006):

misdo
    v 1: do wrongly or improperly; "misdo one's job"